Sherlock Holmes and the disappearing diamond

"John Watson has barely settled into his new school, Baker Street Academy, when his teacher announes a trip to one of London's top museums, home to the Alpine Star, the world's most famous jewel. But the gem has been stolen! The police are soon on the trail, and the whole world is talking about the crime. When police catch the thief along with the stolengem, it seems the case is closed. But Sherlock Holmes has other ideas. With John, their friend Martha, and their trusty canine companion, Baskerville, at his side, can he uncover the mystery behind this extraordinary gem?"--Back cover.